What are Allegro's image and thumbnail requirements?

Allegro thumbnails should use a white background (RGB 255,255,255) with the longer side at least 400 pixels; gallery images need at least 500 pixels on the longer side, up to 26 megapixels and around 2560 x 2560 display.

What is the minimum Allegro image size?

Allegro thumbnails need a longer side of at least 400 pixels and gallery images at least 500 pixels on the longer side. Maximum resolution is 26 megapixels and display is capped near 2560 x 2560 pixels.

What background does an Allegro thumbnail need?

Allegro thumbnails should use a standard white background (RGB 255,255,255), except for documented category exceptions. Gallery images may use other backgrounds, so CatalogPrep scopes the white check to the thumbnail.

Does Allegro allow text, logos, or watermarks on thumbnails?

No. Allegro thumbnails must not include watermarks, text, icons, decorations, or a store logo. CatalogPrep flags text, watermark, logo, and icon risk for manual review before upload.

What image formats does Allegro support?

Allegro supports JPG, JPEG, and PNG for standard uploads, with WEBP accepted via the API or file flow. sRGB is the preferred color profile, and CatalogPrep can convert format and color profile.

What are common Allegro thumbnail rejection reasons?

Common issues are a non-white thumbnail background, text or watermark or store logo on the thumbnail, images under the minimum side length, or images over the 26 megapixel limit.

Allegro

Allegro Thumbnail Image Compliance Checker

Thumbnail-compliance workflow for white-background Allegro images with no text or watermark. Run the free audit, repair flagged images with AI, and export a publish-ready pack.

Run free audit See pricing

Allegro image prep

Thumbnail-compliance workflow for white-background Allegro images with no text or watermark.

Frequently asked questions

What are Allegro's image and thumbnail requirements?: Allegro thumbnails should use a white background (RGB 255,255,255) with the longer side at least 400 pixels; gallery images need at least 500 pixels on the longer side, up to 26 megapixels and around 2560 x 2560 display.
What is the minimum Allegro image size?: Allegro thumbnails need a longer side of at least 400 pixels and gallery images at least 500 pixels on the longer side. Maximum resolution is 26 megapixels and display is capped near 2560 x 2560 pixels.
What background does an Allegro thumbnail need?: Allegro thumbnails should use a standard white background (RGB 255,255,255), except for documented category exceptions. Gallery images may use other backgrounds, so CatalogPrep scopes the white check to the thumbnail.
Does Allegro allow text, logos, or watermarks on thumbnails?: No. Allegro thumbnails must not include watermarks, text, icons, decorations, or a store logo. CatalogPrep flags text, watermark, logo, and icon risk for manual review before upload.
What image formats does Allegro support?: Allegro supports JPG, JPEG, and PNG for standard uploads, with WEBP accepted via the API or file flow. sRGB is the preferred color profile, and CatalogPrep can convert format and color profile.
What are common Allegro thumbnail rejection reasons?: Common issues are a non-white thumbnail background, text or watermark or store logo on the thumbnail, images under the minimum side length, or images over the 26 megapixel limit.